Insulating Polymers as Additives to Bulk‐Heterojunction Organic Solar Cells: The Effect of Miscibility

Liu, Chunhui; Xiao, Chengyi; Xie, Chengcheng; Zhu, Qinglian; Chen, Qiaomei; Ma, Wei; Li, Weiwei

doi:10.1002/cphc.202100725

Cited by 21 publications

(17 citation statements)

References 44 publications

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“…Moreover, large SBS aggregates could negatively affect the crack onset strain through interface adhesions. Inferior interfaces between the SY matrix and large SBS aggregates would generate more cavities, leading to an easier generation of the cracks . Both the COS and Young’s modulus measurements indicated that the stretchability of the SY film was improved by blending SBS up to 25%.…”

Section: Resultsmentioning

confidence: 99%

Light-Emitting Polymer Blended with Elastomers for Stretchable Polymer Light-Emitting Diodes

Jeon

Park

2022

Macromolecules

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Intrinsically stretchable light-emitting diodes (LEDs) will be critical components in future stretchable electronics. However, limited research has been conducted on stretchable electroluminescent (EL) layers for LED devices. Blending conjugated polymers (CPs) with an elastomer has been a simple and effective method enabling widespread use of stretchable polymer semiconductors in stretchable field-effect transistors (FETs). In this study, we adopted the concept of blending elastomers into CPs for use in stretchable polymer LEDs (PLEDs). By blending light-emitting polymers prepared from polyphenylenevinylene (PPV) derivatives with thermoplastic polystyrene-block-polybutadiene-block-polystyrene (SBS) elastomers, a stretchable emission layer (EML) was fabricated, and its mechanical, electrical, and morphological properties were studied. The blended film was stretched up to 60% before vertical cracking occurred, and it maintained its pristine electrical properties. Finally, stretchable PLEDs were fabricated with the use of stretchable EMLs, and this showed that 50% of the maximum luminance was maintained upon stretching up to 60%.

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Section: Resultsmentioning

confidence: 99%

Light-Emitting Polymer Blended with Elastomers for Stretchable Polymer Light-Emitting Diodes

Jeon

Park

2022

Macromolecules

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“…[ 3a ] However, the addition of elastomers often induced the strong phase separation of elastomer domains from the active domains and deteriorated the charge generation and transport properties of the PSCs. [ 3a,7 ] For instance, introducing 30 wt.% of the SEBS elastomers into the PM6:N3 system drastically increased the domain size of blends from 17 to 242 nm and reduced the PCE of the PSCs from 15.4 to 11.3%. [ 3a ] Therefore, molecular design for preventing strong phase separation between the elastomers and conjugated polymers should be developed for enhancing the stretchability of the blend films without compromising the PCEs of the PSCs.…”

Section: Introductionmentioning

confidence: 99%

Poly(dimethylsiloxane)‐block‐PM6 Polymer Donors for High‐Performance and Mechanically Robust Polymer Solar Cells

et al. 2023

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High power conversion efficiency (PCE) and stretchability are the dual requirements for the wearable application of polymer solar cells (PSCs). However, most efficient photoactive films are mechanically brittle. In this work, highly efficient (PCE = 18%) and mechanically robust (crack‐onset strain (COS) = 18%) PSCs are acheived by designing block copolymer (BCP) donors, PM6‐b‐PDMSx (x = 5k, 12k, and 19k). In these BCP donors, stretchable poly(dimethylsiloxane) (PDMS) blocks are covalently linked with the PM6 blocks to effectively increase the stretchability. The stretchability of the BCP donors increases with a longer PDMS block, and PM6‐b‐PDMS19k:L8‐BO PSC exhibits a high PCE (18%) and 9‐times higher COS value (18%) compared to that (COS = 2%) of the PM6:L8‐BO‐based PSC. However, the PM6:L8‐BO:PDMS12k ternary blend shows inferior PCE (5%) and COS (1%) due to the macrophase separation between PDMS and active components. In the intrinsically stretchable PSC, the PM6‐b‐PDMS19k:L8‐BO blend exhibits significantly greater mechanical stability PCE80% ((80% of the initial PCE) at 36% strain) than those of the PM6:L8‐BO blend (PCE80% at 12% strain) and the PM6:L8‐BO:PDMS ternary blend (PCE80% at 4% strain). This study suggests an effective design strategy of BCP PD to achieve stretchable and efficient PSCs.

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“…Many strategies have been used to improve their mechanical properties, including physically mixed insulating polymers (PS, PDMS, SEBS, etc. ), covalently linked insulating polymer chains into the backbones or side chains, ternary OSCs by using the third conjugated components, and adjusting the amorphous/crystalline nature. − These methods can indeed help to improve the COS, but there are still some issues. For example, the addition of insulating polymers will dilute the conjugated components, and the enhancement of the amorphous region will lower charge carrier mobilities and PCEs in OSCs. , It will be an important task to develop conjugated polymers with excellent mechanical properties and meanwhile provide high performance in OSCs.…”

Section: Introductionmentioning

confidence: 99%

Revisiting Conjugated Polymers with Long-Branched Alkyl Chains: High Molecular Weight, Excellent Mechanical Properties, and Low Voltage Losses

et al. 2022

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High-molecular-weight conjugated polymers exhibit excellent mechanical properties due to long-chain entanglement, but it is challenging to increase molecular weight since conjugated polymers with rigid backbones show low solubility and tend to be precipitated during polymerization. In this work, we have successfully obtained high-molecular-weight polymers through the introduction of long-branched alkyl chains and optimization of polymerization conditions. Three conjugated polymers with long 2-octyldodecyl side units were obtained with number-average molecular weights (M n s) of 38.8 kDa (OD-PM6_L), 81.2 kDa (OD-PM6_M), and 178.3 kDa (OD-PM6_H), while the conjugated polymer PM6 with short 2-ethylhexyl units showed an M n of 43.8 kDa. The branched side units and molecular weight have a significant influence on the mechanical properties, in which the elastic ranges and the crack-onset strains were enhanced to >20% and >170% in OD-PM6_H thin films. In addition, due to the suppressed non-nonradiative recombination via increasing the donor− acceptor spacings, organic photovoltaic devices based on OD-PM6_H showed an efficiency of over 13% with low voltage loss. These results demonstrate that introducing longer side units into conjugated polymers provides the opportunity to realize high molecular weight, resulting in excellent mechanical properties and high efficiencies in organic solar cells toward flexible applications.

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Insulating Polymers as Additives to Bulk‐Heterojunction Organic Solar Cells: The Effect of Miscibility

Cited by 21 publications

References 44 publications

Light-Emitting Polymer Blended with Elastomers for Stretchable Polymer Light-Emitting Diodes

Light-Emitting Polymer Blended with Elastomers for Stretchable Polymer Light-Emitting Diodes

Poly(dimethylsiloxane)‐block‐PM6 Polymer Donors for High‐Performance and Mechanically Robust Polymer Solar Cells

Revisiting Conjugated Polymers with Long-Branched Alkyl Chains: High Molecular Weight, Excellent Mechanical Properties, and Low Voltage Losses

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